Fix spelling mistakes.  Bugfix candidates.
diff --git a/Modules/gcmodule.c b/Modules/gcmodule.c
index b607d38..d883b91 100644
--- a/Modules/gcmodule.c
+++ b/Modules/gcmodule.c
@@ -615,7 +615,7 @@
 }
 
 static char gc_set_thresh__doc__[] =
-"set_threshold(threshold0, [threhold1, threshold2]) -> None\n"
+"set_threshold(threshold0, [threshold1, threshold2]) -> None\n"
 "\n"
 "Sets the collection thresholds.  Setting threshold0 to zero disables\n"
 "collection.\n"